Claire Danes and Damian Lewis engage in further skullduggery on the return of "Homeland," and Michael Sheen and Lizzy Caplan examine human sexuality in the new docudrama "Masters of Sex." 9 and 10 p.m. Showtime

Stephen Merchant, best known as Ricky Gervais' gawky crony, tries his luck on the singles' scene in the new comedy "Hello Ladies." 10:30 p.m. HBO

MONDAY

You're gonna hear her roar! Katy Perry is among the many, many performers at the "iHeartradio Music Festival." 8 p.m. KTLA; also Tue.

Tony Shalhoub, Jerry O'Connell and Kal Penn all have XY chromosomes and are therefore qualified to star in the new sitcom "We Are Men." 8:30 p.m. CBS

Established rock band desperately seeks lead singer, as told in "Don't Stop Believin': Everyman's Journey" on a new "Independent Lens." 10 p.m. KOCE

TUESDAY

The surfer who fell from grace with sea: The late Eddie Aikau is remembered on a new installment of "30 for 30." 5 p.m. ESPN; also Wed. 6 p.m. ESPN2

Tween-wolf? They're getting younger every year in the new supernatural drama "Wolfblood." 8 p.m. Disney